Metal-bending machine.



PATENTED APR. 9, 1907.

' G. H. WHITE. METAL BENDING MAGHINE.

APPLIGATIOH FILED FEB. 20, 1906.

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G. H. WHITE. METAL BENDING MACHINE.

APPLICATION FILED FEB. 20, 1906.

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METAL BBNDING MACHINE.

APPLICATION FILED 20. 1905.

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GEORGE HENRY WHITE, OF OIL CITY, PENNSYLVANIA, ASSIGN OR TO S. R.DRESSER MANUFACTURING COMPANY, OF BRADFORD, PENNSYLVANIA.

IVIETAL-BENDING MACHINE.

Specification of Letters Patent.

Patented April 9, 1907.

Application filed February 20. 1906'. Serial No. 302,055.

. tion of the invention, such as will enable others skilled in the artto which it appertains to make and use the same.

My invention consists in the novel features hereinafter described,reference being had to the accompanying drawings, which illustrate oneform in which I have contemplated embodying my invention,- and the saidinvention is fully disclosed in the following description and claims.

Referring to the said drawings, Figure 1 represents a side elevation ofa metal-bending machine embodying my invention. Fig. 2 is a verticalcentral longitudinal sectional view of the same, parts being shown inelevation. Fig. 3 is a front elevation of the machine. Fig. 4 is apartial front elevation of the machine, showing the operation of bendinga metal blank. Fig. 5 is atop plan view of the rolls and adjacent parts,parts of the machine being shown in section. Fig. 6 is a detailperspective view of a portion of a blank which it is desired to bendinto ring form in the machine herein shown and described.

The object of my invention is to provide a machine for bending metalblanks into the form of rings or short tubes preparatory to welding,although it may be used for other purposes, and the particular apparatusherein. shown is especially designed to bend into ring form a blank cutfrom a metal skelp and provided 011 one face with a central projectingbead or rib which is intended to project inwardly from. the innerface ofthe completed ring.

In Fig. 6 I have shown a portion of such a blank in detail, in which Arepresents the body of the blank, which may be severed from a rolledskelp in any desired manner, and a is the central longitudinal bead,projecting from one face of the skelp. The ends of the skelp (one ofwhich is shown at a) are preferably parallel and cut at an angle to theplane of the main body, so that they will unite advantageously when theyare welded together after being bent into the form of a ring or tube.

B represents the base-plate of the bendingmachine, upon which aresecured the forward vertical standard O and rearward vertical standardO.

D represents the lower roll-shaft, which is horizontally disposed and ismounted in fixed bearings in the standards O and C. At the front end ofthe machine the shaft D is provided with a reduced portion whichreceives the lower bending-roller D, provided with lateral peripheralflanges (Z (Z for guiding the blank, said roller being secured on theshaft by a suitable nut (1, so that it can be removed and replaced whenworn. At its rear end the shaft D is provided with a driv ing-gear Dengaging a pinion E on a drivjing-shaft E, mounted in bearings in thestandard O and in a separate standard C or bearing-support and saidshaft is provided with the usual fast and loose pulleys 'E E, by meansof which the machine is driven. The shaft D is also provided (preferablybetween the standards O and O) with a pinion D, as shown. I

F represents a vertically-movable swinging frame for carrying the upperbending-roll shaft, said frame being pivoted at f in the standard O andhaving its forward end eX- tending into a vertical slot 0 in thestandard O. The frame F is provided on its lower side with bearings f f,in which is mounted the shaft G for the upper bending-roll. The forwardend of the shaft G is reduced to receive the upper bending-roll G, whichis provided with a central annular groove 9 to receive the rib or bead aof the blank A, and said roll is held in position by a nut g. The shaftG is also provided with a pinion G engaging the pinion D on shaft D, sothat the two bending-rolls are driven in opposite directions by thedriving-shaft E. Said pinions D and G are provided with teeth of suchlength that they will remain at all times in gear notwithstanding thevertical movements of the swinging frame F. The upper roll G is of alength equal to the distance between the lateral flanges d d of the rollD, so that when the two rolls are in operative position the portion ofthe blank between them" will be entirely inclosed, as will be seen inFig. 2.

The swinging frame F and upper roll and dined-plane face 72/, having atits lower and shaft are normally held in such a position that thebending-rolls are separated, and this is accomplished by means ofcounterbalancing devices. In the present instance 1 provide at each sideof the machine a counterbalance-lever h, pivoted at 72 to a bracketsecured to the base-plate B and provided at one end with an adjustableweight H, the

other end of the lever 71 being connected by a link 7L2 with theswinging frame F. The counterbalance-weights H H thus maintain the saidswinging frame and upper roll normally in raised position.

I provide the following mechanism for depressing the upper bending-rolland its swinging frame, which is so constructed that the roll can bedepressed or released by a quarterturn or swing ,of an operating-arm,thus greatly expediting the work of the machine. This mechanism is bestseen in Fig. 2.

L represents a stationary cam located at the upper end of the recess ain standard 0 and provided with a hollow attaching sleeve or bushing Z,which extends vertically through an aperture in the upper part of saidstandard and is secured therein by a setscrew Z. The sleeve or bushingis of less diameter than the cam, forming a shoulder at the upper end ofthe cam which directly engages the top face of the recess a and relievesthe bushing Z and set-screw Z of strain.

M is a rotatable cam located below the stationary cam and rigidlysecured to ahollow shaft m, the upper end of which is squared andreceives an operating-lever m. See Fig. 3.) The interior of the shaft mis counterbored and the lower portion is threaded internally to receivean adjusting-screw shaft m, which may be projected below the cam M todirectly engage the swinging frame F. The upper end of the screw-shaft mis threaded and is provided above the upper end of the hollow shaft mwith a j am nut or nuts m (two being shown) and a hand-wheel or otheroperating device m. The opposing faces of the cams L and M are soconstructed that a quarter-turn of the shaft we will bring the highparts of the cams together and depress the swinging frame F to bring theupper bending-roll into operative relation with the lower roll, and aquarter-turn of shaft m in the opposite direction will allow thecounterbalance-weights to lift the said frame and upper rollsufficiently to allow of the insertion and removal of the bent blank.The parts can be accurately adjusted by means of the screw-shaft m whichcan also be adjusted from time to time to compensate for any wear of theparts.

N represent a heavy bracket-casting provided with a depending flange non its inner side which is bolted to the standard C. This casing has arecess to accommodate the lower i l I l l outer end a perforated ear 71the aperture in which is threaded'to receive a set-screw 775, providedwith a am-nut n.

O represents a sliding adjustingblock mounted on the inclined face a andsecured adjustably thereto by means of a screw 0 (or bolt) passingthrough a longitudinal slot 0. The upper end of the block 0 is providedwith ears 0 in which is mounted the lateral bending-roll 0", and thelower end of said block is ,referably provided with an abutment or lug0*, which is engaged by the adjustingscrew n On the opposite side of thecasting N is an inclined guiding-face a provided on each side with aflange a, said flanges being arranged so as to guide the lateral edgesof the blank as it is pushed into the machine, so that the rib a thereofwill engage the groove 9 in the upper roll, and the inclined face willguide the blank so that it will engage the top of the lower roll. Prepresents a belt-shifter lever pivoted upon the base of the machine andconnected to a sliding shifter-bar p, guided in a bracket secured tostandard C and provided with beltengaging arms p p for shifting thedrivingbelt from the loose to the fast pulley, and vice versa.

In using this apparatus the blanks are heated and inserted one at a timeinto the machine, the blank being pushed up the inclined face a, betweenthe flanges n thereof, until its end lies upon the lower roll D betweenits flanges (Z. The depressing mech anism for the upper roll is thenoperated by giving the shaft m a quarter-turn, thus bringing the upperroll G down upon the blank A, the bead to entering the groove gin theupper roll. The rolls D and G being rotated by the driving-shaft, assoon as the blank is gripped between them it will be drawn in be tweenthem and forced into contact with the lateral bending-roll 0 as shown inFig. 4 in full lines, thus bending the blank, and the operati on iscontinued until the blank has passed entirely between the rollers G andD, when it will be bent into a substantially perfect ring form. Theupper roll is then lifted, thus stopping the movement of the blank, andthe bent blank is removed and the ends welded in any suitable manner.

By adjusting the plate 0 so as to bring the roller 0 nearer to orfarther from the rollers G and D the machine is adapted for bendingblanks of different lengths to make rings of different diameter, asindicated in Fig. 4, in which dotted lines indicate a position of theroller 0 nearer to the main rolls G and D than that shown in full lines,and a portion of a blank for a ring of smaller diameter is also shown.If a blank is used not having a bead a, the groove g in the roller G maybe disroll and on one side is provided with an inl pensed with. In thepresent case, however,

this groove is necessary to prevent the flattening out of the bead,which would otherwise occur.

What I claim, and desire to secureby Letters Patent, is-

1. In a metal-bending machine, the combination with the main frame, afixed roller mounted therein, a pivoted frame, a movable roller mountedtherein, and mechanism for driving the fixed and. movable rollers, of astationary cam, on the main frame, a rotatable cam, constructed toengage the stationary cam, and having a part engaging the pivoted frame,for moving said movable roller toward the stationary roller, andoperating means for said rotatable cam, substantially as described.

2. In a metal-bending machine, the combination with the main frame, afixed roller mounted therein, a pivoted frame, a movable roller mountedtherein, and mechanism for driving the fixed and movable rollers, of astationary cam, on the main frame, a rotatable cam, constructed toengage the station ary' cam, and having a part engaging the pivotedframe, for moving said movable roller toward the stationary roller, oneof said cams being provided with an adjustable bearing part engagingsaid pivoted frame for varying the amount of movement of said pivotedframe and movable roller, and means for operating said rotatable cam,substantially as described.

3. In a metal-bending machine, the combination with a fixed roller and aroller movable with respect thereto, of means for moving said movableroller into operative relation with the fixed roller comprising amongtheir members, a fixed cam, a rotatable cam in engagement therewith, anoperating-shaft for said rotatable cam extending through said fixed'cam, a part connected with said rotatable cam for engaging a partconnected with the movable roller, and an operating device connectedwith said shaft, substantially as described.

4. In a metal-bending machine, the com bination with a fixed roller anda roller movable with respect thereto, of means for moving the movableroller into operative relation to the fixed roller comprising among itsmembers, a fixed cam, a rotatable cam engaging the same, and providedwith a shaft extending through the fixed cam, an adjusting deviceextending longitudinally through said shaft and engaging a partconnected with the movable roller, and an operating device connectedwith said shaft, substantially as described.

5. In a metal-bending machine, the combination with a main frame and afixed and a movable roller, of a fixed cam having a horizontal cam-face,and a hollow sleeve of less diameter than the cam, engaging an aperturein a portion of said frame and secured there- 1 in, a rotatable camengaging the fixed cam and provided with a hollow shaft extendingthrough said sleeve, an operating device connected with said shaft, anadjusting-screw extending longitudinally through said shaft and the camsecured thereto and engaging a part connected with said movable roller,a hand-operating device for said screw, and locking means for securingsaid screw in its adjusted position, substantially as described.

6. In a metal-bending machine, the combination with the main frame, anda fixed roller mounted therein, of a frame pivotally connected to saidmain frame, a movable bending-roller mounted in said pivoted frame,driving mechanism for said fixed and movable rollers, a rotatable camfor moving said pivoted frame and movable roller toward the fixedroller, and an adjustable part cooperating with said cam for varying theposition to which said movable roller is moved by equal movements ofsaid rotatable cam, and an operating device connected to said cam,substantially as described.

7. In a metal-bending machine, the combination with the main frame, anda fixed roller mounted therein, of a frame pivotally connected to saidmain frame, a movable bending roller mounted in said pivoted frame,driving mechanism for said fixed and movable rollers, a rotatable camfor moving said pivoted frame and movable roller toward the fixedroller, a bearing part carried by said cam, and engaging said pivotedframe, means for adjusting said bearing part with respect to said cam,and an operating device for said cam, substantially as de scribed.

8. In a bending-machine, the combination with the main frame and a fixedbendingroller carried thereby, of a frame pivotally connected to themain frame, a movable bending-roller mounted in said pivoted frame, arotatable cam having a cam portion on a face disposed at an angle to itsaxis of rotation, and interposed between said pivoted frame and a partconnected with the main frame, a hand-operated lever for said shaft andan adjusting-screw extending longitudinally through said shaft andthrough said cam and engaging said pivoted frame, substantially asdescribed.

9. In a metal-bending machine, the-combination with the main frame, of ashaft mounted in fixed bearings in said frame, and having a portionextending beyond said frame and carrying a bending-roller, of a swingingframe, pivotally mounted in the main frame, a shaft mounted in saidswinging frame, and having a projecting portion at the end farthest fromthe said pivotal connection carr ing a bending-roller, adapted tocooperate with the fixed bending-roller, a counterbalance for saidswinging frame normally holding the roller carried thereby out IIO ofoperative relation with the fixed roller, and a rotatable cam having apart connected therewith for engaging said swinging frame, to move theroller carried thereby into operative relation with the fixed roller,substantially as described.

10. In a metal-bending machine, the combination with the main frame, afixed shaft mounted therein and having one end projecting beyond themain frame, and a bendingroller carried by said projecting portion ofthe fixed shaft, of a vertically-movable frame pivoted to the main frameand having its free end working in a vertical slot in said main frame, ashaft mounted in said pivoted frame, having a projectingportion-extending over the fixed bending-roller, a movablebending-roller mounted on the projecting portion of said movable shaft,and provided with a central annular groove, driving mechanism for saidshafts, a bracket secured to the main frame adjacent to said fixedrollers and provided on one side thereof with a horizontal guide, havinglateral guiding portions, and on the other side of said roller, with aninclined support, an adjustable bending-roll, located on said support, acounterbalance for said pivoted frame and the roller carried thereby,and means for forcing said movable frame toward the fixed bendingroller,substantially as described.

In testimony whereof I al'fix my signature in the presence of twowitnesses.

GEORGE HENRY l/VHITE.

l/Vitnesses:

Jos. W. BARR, ELIZABETH MULLIGAN.

